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Citation: LI Ding, GAO Baojiao, WEI Xiaopeng. Preparation of Grafted SiO₂-g-PMAA Particles with High Grafting Degree via a Surface-initiated Graft Polymerization Method[J]. Chinese Journal of Applied Chemistry, ;2011, 28(2): 154-158. doi: 10.3724/SP.J.1095.2011.00167 shu

Preparation of Grafted SiO₂-g-PMAA Particles with High Grafting Degree via a Surface-initiated Graft Polymerization Method

1.
Department of Chemical Engineering, North University of China, Taiyuan 030051

Corresponding author: GAO Baojiao,
Received Date: 23 March 2010
Available Online: 2 June 2010
Fund Project: 山西省自然科学基金资助项目(2008021013) (2008021013)

Coupling agent γ-aminopropyltrimethoxysilane(AMPS) was firstly bond onto the surface of silica gel particles forming modified AMPS-SiO₂ particles.With the presence of ammonium persulphate in the solution,a redox initiating system was then achieved and allowed the surface-initiated graft polymerization of methacrylic acid(MAA) on the silica gel particles with a high grafting degree(0.30 g/g).The effects of different factors on the whole process were investigated in depth.The experimental results show that an optimal temperature for the surface-initiated graft polymerization system is 40℃.At higher temperature,the graft degree will decline due to the heat decomposition of ammonium persulphate.In addition,the grafted polymer layer hinders further polymerization.The appropriate reaction conditions are:1.1% of the initiator and nearly 5% of the monomer concentration.
- methacrylic acid,
- silica gel,
- redox initiating system,
- surface-initiated graft polymerization,
- grafting degree
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Preparation of Grafted SiO₂-g-PMAA Particles with High Grafting Degree via a Surface-initiated Graft Polymerization Method